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The KUnit test validates the correct operation of the ringbuffer. A separate dedicated ringbuffer is used so that the global printk ringbuffer is not touched. Co-developed-by: John Ogness <john.ogness@linutronix.de> Signed-off-by: John Ogness <john.ogness@linutronix.de> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Reviewed-by: Petr Mladek <pmladek@suse.com> Link: https://patch.msgid.link/20250612-printk-ringbuffer-test-v3-1-550c088ee368@linutronix.de Signed-off-by: Petr Mladek <pmladek@suse.com>